Detachable laminated pole-piece for dynamo-electric machines



(No Model.)

H. GEISENHNER. DETACEABLE LAMINATED ECLE PIECE ECE DYNAMC ELECTRICMACHINES.

No. 596,152. Patented DCC. 28, 1897.

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d MH C w UNITED STATES PATENT @Erica HENRY GEISENHNER, OF SOHENEOTADY,NEW YORK, ASSIGNOR TO TllE GENERAL ELECTRIC COMPANY, OF NEV YORK;

DETACHABLE LAMINATED POLE-PIECE FOR DYNAMGELECTRK MACHINES.

SPECIFCATION forming part of Letters Patent No. 596,152, dated December28, 1897.

Application filed October 11,1897. Serial No. 654,796. (No model.)

.To all whom, "1mi/,y concern.- pieces may be mounted in place withoutthe Be itknown that I, HENRY GEISENHNER, a aid of tools. The ironlaminze of which the citizen of the United States, residingatSchenpolesare composed are preferably counterectady, in the county of Schenectady,State part punchings, although the section and 55 5 of New York, haveinvented certain new and shape of certain of them may be varied, ifdeuseful Improvements in Detachable Lamisired. ln each of the lamime areholes for the nated Pole-Pieces for Dynamo-Electric Maclamping-bolts F,a hole for wedges H and ll', chines, (Oase No. 605,) of which thefollowing and a slot G, which divides the lower portion is aspecification. oi the lamina; into two parts. Preferably the 6o 1o Theobject of my invention is to provide a holes and slots in the punchingsare made by detachable laminated pole-piece that is cheap the same diethat forms thc main body. Dy to construct and which requires noparticular this arrangment all work on the laminze is skill to assemblein position on the machine. done at one operation, thereby reducing` theIn the accompanying drawings, Figure l is cost and simplifying theconstruction. l have 65 l5 a partial side elevation of my improvedpolefound that it works very satisfactorily to piece mounted in positionon a revolving spimalte slot G with a shearing cutter. Then no der. Fig.2 is a partial section of the same. material is wasted, and there ispractically no Fig. 3 is a sectionaldetail of the clampingair-spacebetween the two lower portions of wedges, taken on line 3 3 of Fig. land Fig. the pole. For the purpose of illustration slot 7o 2o 4 is aslight modification. G has been slightly enlarged; but it is to be Myinvention is shown in connection with understood that it can be anydesired width. a revolving field-magnet structure, where it ledges Iland Il are formed by dividing has the greatest utility; but it can beapplied a round steel bar into two parts, the line of to a stationaryiieldfmagnet, if desired. division extending diagonallyfrom one end to75 The spider A consists of a hub O, having a the other. These wedgesare adapted to be number of unconnected arms B with enlarged inserted inthe pole-piece from opposite ends ends. Surrounding the enlarged ends ofthe and as they are forced together expand the arms is a ring or rim D,forming a support for lower part of the pole-piece, causing it to be thepole-pieces- This ring is shrunk in place; retained in position byfriction between the 8o 3o but other means of securing it may beemdovetail projection and side of the slot.

ployed. Extending across the outer periph- In Fig. Z a eld-coil .l isshown in section ery of the rim and parallel to the shaft of theonapole-piece, with the insulation and means machine are dovetail slots,and in these slots employed to retain the coil in position clearly aremounted pole-pieces E. The slots in the illustrated. 85 3 5 rim arepreferably made by a milling-cutter, Fig. 3 shows a sectional view of adovetail so that they will be counterparts. projection in which wedgesll and H are Each pole-piece comprises a bundle of limishown in theirnormal position with the polene having heavier end plates E and securedpiece expanded.

together by bolts extending parallel with the Fig. @t shows a slightmodiiication in which 9o dovetail slots. The outer end of each poletwoslots G and G are provided and a set of piece is enlarged. Thisincreases the polewedges for each slot. y

face and at the same time provides reliable In assembling the machine acoil J is placed means for retaining the field-coil J against inposition on a pole-piece. rhe dovetail procentrifugal action. The innerend of each jection of the pole is mounted in a slot in the 95pole-piece has a dovetail projection E2, adaptrim and wedges H and Hdriven into place.

ed to fit into a similarly-shaped slot in the rim This slightly expandsthe lower end of the D. On each side of the dovetail projection pole andbinds it in place. ln a machine are shoulders E3, adapted to rest on rimD and havin a revolving field-magnet there is comform a part of thesupport. lt is intended paratively little force tending to move the roothat there shall be a good working iit between pole-pieces in adirection parallel to the shaft;

-the pole-pieces and rim, so that the polebut the centrifugal action ismore or less great, depending upon the speed of the machine. Thedovetail construction presents many desirable features and has beencommonly used; but the means employed in securing the field-poles inposition have not been entirely7 satisfactory. In certain priorconstructions Wedges have been employed which were located on both sidesof the pole between the sides of the core and the rim or support. Thisnecessitated very accurate adjustment. Otherwise one side would bewedged slightly different from the other and the pole-face would benearer its adjacent pole-face on one side than the other. 1n otherWords, it Was the wedges which formed the support for the poles anddetermined their position. To enable the poles to be set up in theirproper position, it has been found nceessary to separately tit all ofthe poles, and in taking down a machine for repairs to mark all of thekeys and pole-pieces and the place they occupy in the support., so thatthey may be set up again correctly. By making the dovetail projectionsof the pole-pieces a working fit with the dovetail slots and providingshoulders which rest on the rim a very slight lateral expansion of thepole will serve to clamp it in place, and the wedges in no Way form asupport vfor the poles.

'What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

l. In a dynamo-electric machine, the combination of a support providedwith slots eX- tending parallel to the shaft of the machine, laminateddetachable pole-pieces having projections inserted in the slots, andmeans for securing the pole-pieces in place by expanding them at thepoint where they enter the slots.

2. ln a revolving field-magnet structure for dynamo-electric machines,the combination of laminated detachable field-poles having splitdovetail projections at one end, a support havin dovetail slotsextending parallel to the shaft of the machine in which the poles aremounted, and Wedges for expanding the dovetail projections ot the poles.

3. ln a revolving Held-magnet structure vfor dynamo-electric machines,the combination oi' laminated detachable pole pieces, each pole-piecebeing slotted and provided with a dovetail projection atoue end and anoverhanging portion to retain the field-coil at the other, and bolts forsecuringr the lamime together, a ring or support having` dovetail slotsin which the pole-pieces are mounted, and a pair of wedges for eachpole-piece adapted to be inserted in position from the opposite ends toexpand the dovetail portion ot' the pole.

lu Witness whereof l have hereunto set my hand this (5th day of October,1897."

HENRY GEISENIIONER.

Witnesses:

B. l. HULL, A. F. MACDONALD.

